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《Progress In Geography》 2005-06
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Preliminary Research of Effect of Cultivation on Soil Organic Carbon in Alpine Meadow

LI Yuemei, WANG Yuesi, CAO Guangming, DU Yangong (Northwest Plateau Institute of Biology, Chinese Academy of Science, Xining 810001; Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029; Soil and Fertilizer Institute, Qinghai Academy of Agricultural and Forestry Science; Graduate School of Chinese Academy of Science, Beijing 100039)  
This paper studies the effects of alpine meadow cultivated on soil organic carbon (SOC) using soil physical fraction to understand the stability of SOC at Haibei research station zone, CAS. The SOC contents and its fraction in soil physical fraction (light fraction organic carbon (LFOC) and Heavy fraction organic carbon (HFOC)) in 0-40cm soil depth were investigated. The law of soil organic carbon changed with the cultivation year is studied synchronously. The artificial grassland was selected by different cultivation year (0, 1, 11, 16, 20 yr) after alpine meadow had been cultivated. The results showed that SOC, LFOC and HFOC only decreased in 0-10cm, and respectively, lost 10.97 %, 7.75 % and 7.4 % with 20 years of cultivation,which was mainly caused by wind erosion, tillage erosion and soil organic matter decomposition in 0-10cm after cultivation. The gross organic matter in 0-10cm leached with the rainwater to deposit in deeper horizon of soils. SOC, LFOC and HFOC increased in 0-40 cm soil depth, respectively, with the rate of 0.08 tC·hm-2·yr-1, 0.07 tC·hm-2·yr-1 and 0.14 tC·hm-2·yr-1 after conversion of alpine meadow to artificial grassland for 20 years. Furthermore, the results indicated that conversion of alpine meadow to artificial grassland did not affect the carbon sink function of alpine meadow, but the storage of carbon-fixed in the soil-plant systems decreased obviously compared to the alpine meadows: the rate ranged from 7.38 tC·hm-2·yr-1 to 6.89 tC·-1hm-2·yr-1。
【Fund】: 国家自然科学基金项目(40471133);; 中国科学院知识创新工程重大项目——中国陆地和近海生态系统碳收支研究(KZCX1-SW-01);; 中国科学院资源环境领域野外台站研究基金的支持。
【CateGory Index】: S153
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